JPH04326974A - Processing method and treating device of waste - Google Patents

Abstract

PURPOSE: To process the waste products at a minimum cost by shredding scrap adulterated by organic components into particles having a maximum size of 5 cm, converting the particles into solids and pyrolysis gas at about 550-600 deg.C in a pyrolysis stage, separating the solids into metals and pyrolysis coke in a mechanical processing state and adding an oxidizing agent or the like in a high temperature gasification stage. CONSTITUTION: The method for processing the waste products is comprised of shredding a metal scrap 1 adulterated by organic components into particles having a maximum size of 5 cm by passing it through a shredder 2, transfering the particles into a pyrolysis stage 3 which is operated about 550-600 deg.C to convert the particles into solids 5 and pyrolysis gas 4 by the pyrolysis, separating the solids 5 into metals 7 which is suitable for reuse and pyrolysis coke 8 in a mechanical processing stage 6, supplying the pyrolysis coke 8 to a high-temperature gasification stage 14 which introduces the pyrolysis gas 4 from the pyrolysis stage 3 and which is provided with supply lines for energy 23, an oxidizing agent 9 and optionally metallurgical coke 10, and subjecting the pyrolysis coke 8 to high-temperature treatment, resulting in a vitrified construction material 19 and energy 20. After purifying, heating gas 11 can be used for equipment 12 requiring a source of energy.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is directed to adulteration (adulteration) with organic ingredients.
The present invention relates to a method for the pyrolysis treatment of aluminum scrap from automobile shredders adulterated with organic plastics used in the manufacture of vehicles.

0002

[Prior art] German patent (DE 36 35 06
8 C2) discloses a method for thermally treating wastes such as soil, kitchen waste, troublesome waste, and sewage sludge contaminated with hazardous substances, and in this method, all volatile substances are removed. It is converted into a gas and/or vapor phase and separated from the solids to be treated. In this process, the volatile substances generated from the solid degassed material in the degassing step are passed over a solid bed of coke operating at a temperature of approximately 1,200 °C in a reducing atmosphere shut-off air, and then the solid degassed material is It is further cleaned before being fed to a high temperature stage where it incinerates the waste. This method is not described as being particularly suitable for processing scrap metal.

[0003] High-temperature gasification stages as a single device are also known, but this method requires a high proportion of free primary energy. A pyrolysis step is also known, but this method has the disadvantage of complicated purification of the pyrolysis gas and wastewater, and an additional problem of the high cost of disposing of the coke used in the pyrolysis.

0004

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a method and apparatus for the thermal decomposition treatment of waste adulterated with organic components, which enables the production of recyclable materials with a minimum amount of energy and at a minimum cost. An object of the present invention is to provide a pyrolysis treatment method and apparatus that can treat waste.

[0005]

The above object of the invention is achieved by the features of claim 1 of the appended claims. The following products are obtained from the process according to claim 1: The product is purified in a mechanical pretreatment following the pyrolysis stage and can be fed as clean metal scrap to, for example, a melting plant.

Vitrified structure materials resulting from high temperature gasification stages and energy for consumer use. Flue gas obtained from the final section of a pyrolysis treatment unit. The pyrolysis gas produced in the pyrolysis stage is cleaned and converted into marketable article heating gas and vitrified slag in a subsequent high temperature gasification stage. The supply of primary energy to the high-temperature gasification stage can be minimized by supplying pyrolysis gas obtained from the pyrolysis stage and, depending on the proportion of organic matter included, can be reduced to virtually zero. It can also be reduced.

[0007] Also, the feed to the hot gasification stage is simplified since only pyrolysis coke is required as solid component. In short, very favorable results can be obtained by the method of the present invention in which several single steps, which are known as single steps, are combined and functionally linked. Claims 2 to 5 describe preferred embodiments of the method of claim 1.

For example, the heated gas resulting from the high temperature gasification stage is cleaned of undesirable constituents in a gas scrubber before it is used as an energy source, thereby eliminating the need for denitrification equipment and dioxin filters. You can eliminate gender. If a gas scrubber is provided, the gas is of course returned to the pyrolysis stage after being scrubbed.

The invention also relates to an apparatus for carrying out the method according to claims 1-5. Therefore, claims 6 to 8
The method described above is applied to the device described in .

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described with reference to the accompanying drawings, which schematically show embodiments of the invention. The metal scraps 1 adulterated with organic components are first passed through a shredder 2, which shreds the metal scraps 1 into pieces with a maximum size of 5 cm (pa
ticle size). Larger pieces are returned to the shredder 2 and repeatedly shredded.

[0011] The shredded metal scraps 1 are then given a
Passed to pyrolysis stage 3 operating at a temperature of 600°C. This pyrolysis stage 3 also requires energy 21 and air (
or oxygen) 22. In the pyrolysis stage 3, the solids 5 are separated from the pyrolysis gas 4 by pyrolysis. The solids 5 are then processed in a mechanical treatment step 6.
Separated into metal 7 and pyrolysis coke 8 suitable for reuse.

The purified metal 7 is then fed to a melting plant as clean metal scrap. Pyrolysis coke 8
is fed to a high temperature gasification stage 14 which receives pyrolysis gas 4 from pyrolysis stage 3. The high temperature gasification stage 14 is also characterized by an energy 23 supply line and an oxidizer (
For example, a supply line for air or oxygen (for example) 9 is provided, and a supply line for maker coke 10 is also provided as required.

[0013] Most of the energy required, ie all the energy required in ideal situations, is provided by the pyrolysis gas 4, and the factor by which this energy donation takes place is based on the proportion of organic material. Only the pyrolysis coke 8 needs to be sluiced into the hot gasification stage 14. Pyrolysis gas 4 is supplied via a burner.

The treatment within the high temperature gasification stage 14 is approximately 1.6
It is carried out at a temperature of 0.000°C, so that the material 19 and energy 20 of the vitrified structure are liberated and made available to the consumer. The heated gas 11 produced in the hot gasification stage 14 is conveyed by pipes to a gas scrubber 13 where undesirable constituents such as HCl, HF, dust and dust-containing substances are removed.

The purified gas can then be utilized for energy application equipment 12, such as a boiler. A portion 17 of the purified gas is returned to the pyrolysis stage 3;
Minimize primary energy supply. The energy obtained from the energy application device 12 is available to the consumer along with the energy 20 obtained from the high temperature gasification stage 14.

A flue gas desulfurization plant 16 can be provided after the energy application device 12, if desired. The flue gas desulphurization plant 16 also receives the flue gas 18 resulting from the pyrolysis stage 3. The flue gas 24 after desulfurization is optionally passed through a purification device before being discharged into the atmosphere. Although the above description of the present invention relates to the pretreatment of metal scraps, the present invention
It can also be successfully applied to the treatment of waste and troublesome waste such as kitchen waste.

[Brief explanation of drawings]

FIG. 1 is a drawing showing a schematic configuration of the method and apparatus of the present invention.

[Explanation of symbols]

1 Metal scrap 2 Shredder 3 Pyrolysis stage 4 Pyrolysis gas 5. Solids 6 Mechanical processing stage 7. Purified metal 8 Pyrolysis coke 9 Oxidizing agent 10 Seishi Coke 11 Heating gas 12 Energy application equipment 13 Gas scrubber 14 High temperature gasification stage 16 Flue gas desulfurization plant 17 Part of purified gas 18 Flue gas 19 Part of the vitrified structure 20 Energy 21 Energy 22 Air (or oxygen) 23 Energy 24 Flue gas after desulfurization

Claims (8)

[Claims] 1. A method of pyrolyzing waste such as metal scraps adulterated with organic components, comprising: 1) shredding the metal scraps into pieces with a maximum size of 5 cm;
In a pyrolysis stage (3) operating at a temperature of 0° C., the metal scraps are separated into solids (5) and pyrolysis gases (4); 3) in a mechanical treatment stage (6), the solids ( 5), unadulterated metal (7) and pyrolysis coke (8)
4) The pyrolyzed coke (8) and the pyrolyzed gas (4) generated from the pyrolysis stage (3) are treated with an oxidizing agent (9) and optionally in a high temperature gasification stage (14). Teseishi coke (1
A method for thermally decomposing waste, characterized by adding gas (11) to a heated gas (11) that does not contain organic substances. 2. The high temperature gasification step (14) comprises about 1
The pyrolysis treatment method according to claim 1, characterized in that it operates at a temperature of . 3. Before introducing the heated gas (11) into the energy application device (12), undesirable components such as HCl, HF and dust are removed by a gas scrubber (13).
3. The thermal decomposition treatment method according to claim 1, wherein the thermal decomposition treatment method is performed in a vacuum. 4. A pyrolysis treatment method according to claim 3, characterized in that a part (17) of the gas purified in the gas scrubber (13) is returned to the pyrolysis stage (3). 5. The flue gas originating from the energy application device (12), optionally together with the flue gas (18) originating from the pyrolysis stage (3), is transferred to a desulphurization plant (16).
5. The thermal decomposition treatment method according to claim 4, wherein the desulfurization is carried out within the pyrolysis treatment method. 6. A pyrolysis treatment apparatus for carrying out the method according to claim 1, comprising: 1) a shredder apparatus (2); 2) operating at a temperature of about 550-600°C and using energy
21), a pyrolysis stage (3) externally provided with a supply line for air or oxygen (22) and a supply line for gas (17) returned from the pyrolysis treatment unit; a high-temperature gasification stage (operating at a temperature of
14) A waste thermal decomposition treatment apparatus comprising: 7. After the high temperature gasification step (14),
The pyrolysis treatment apparatus according to claim 6, further comprising a gas scrubber (13) and a boiler (12). 8. The pyrolysis treatment apparatus according to claim 7, characterized in that a flue gas desulfurization plant (16) is provided after the boiler (12).